mirror of
https://github.com/crskycode/GARbro.git
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252 lines
9.0 KiB
C#
252 lines
9.0 KiB
C#
//! \file ArcQLIE.cs
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//! \date Mon Jun 15 04:03:18 2015
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//! \brief QLIE engine archives implementation.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System.IO;
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using System.Text;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System;
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using GameRes.Utility;
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namespace GameRes.Formats.Qlie
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{
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internal class QlieEntry : PackedEntry
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{
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public bool IsEncrypted;
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public uint Hash;
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public uint Key;
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}
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[Export(typeof(ArchiveFormat))]
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public class PackOpener : ArchiveFormat
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{
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public override string Tag { get { return "QLIE/PACK"; } }
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public override string Description { get { return "QLIE engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public PackOpener ()
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{
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Extensions = new string [] { "pack" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (file.MaxOffset <= 0x1c)
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return null;
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long index_offset = file.MaxOffset - 0x1c;
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if (!file.View.AsciiEqual (index_offset, "FilePackVer")
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|| !file.View.AsciiEqual (index_offset+0xC, ".0"))
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return null;
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int pack_version = file.View.ReadByte (index_offset+0xB) - '0';
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if (pack_version != 2)
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throw new NotSupportedException ("Not supported QLIE archive version");
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int count = file.View.ReadInt32 (index_offset+0x10);
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if (count <= 0 || count > 0xfffff)
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return null;
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index_offset = file.View.ReadInt64 (index_offset+0x14);
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if (index_offset < 0 || index_offset >= file.MaxOffset)
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return null;
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int pack_key = 0xC4;
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var name_buffer = new byte[0x100];
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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int name_length = file.View.ReadUInt16 (index_offset);
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if (name_length > name_buffer.Length)
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name_buffer = new byte[name_length];
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if (name_length != file.View.Read (index_offset+2, name_buffer, 0, (uint)name_length))
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return null;
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int key = name_length + (pack_key ^ 0x3e);
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for (int k = 0; k < name_length; ++k)
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name_buffer[k] ^= (byte)(((k + 1) ^ key) + k + 1);
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string name = Encodings.cp932.GetString (name_buffer, 0, name_length);
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var entry = new QlieEntry { Name = name };
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entry.Type = FormatCatalog.Instance.GetTypeFromName (name);
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index_offset += 2 + name_length;
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entry.Offset = file.View.ReadInt64 (index_offset);
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entry.Size = file.View.ReadUInt32 (index_offset+8);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.UnpackedSize = file.View.ReadUInt32 (index_offset+12);
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entry.IsPacked = 0 != file.View.ReadInt32 (index_offset+0x10);
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entry.IsEncrypted = 0 != file.View.ReadInt32 (index_offset+0x14);
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entry.Hash = file.View.ReadUInt32 (index_offset+0x18);
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if (3 == pack_version)
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entry.Key = (uint)pack_key;
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else
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entry.Key = 0;
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dir.Add (entry);
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index_offset += 0x1c;
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}
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var qent = entry as QlieEntry;
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if (null == qent || (!qent.IsEncrypted && !qent.IsPacked))
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var data = new byte[entry.Size];
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if (entry.Size != arc.File.View.Read (entry.Offset, data, 0, entry.Size))
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return arc.File.CreateStream (entry.Offset, entry.Size);
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if (qent.IsEncrypted)
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Decrypt (data, 0, data.Length, qent.Key);
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if (qent.IsPacked)
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{
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data = Decompress (data);
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if (null == data) // probably wrong decryption
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return arc.File.CreateStream (entry.Offset, entry.Size);
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}
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return new MemoryStream (data);
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}
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private void Decrypt (byte[] buffer, int offset, int length, uint key)
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{
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset");
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if (length > buffer.Length || offset > buffer.Length - length)
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throw new ArgumentOutOfRangeException ("length");
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var table = new uint[2,2];
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var xor = new uint[2];
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for (int i = 0; i < 2; ++i)
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{
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table[0,i] = 0xA73C5F9Du;
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table[1,i] = 0xCE24F523u;
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xor[i] = ((uint)length + key) ^ 0xFEC9753Eu;
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}
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unsafe
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{
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fixed (byte* raw = buffer)
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{
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uint* encoded = (uint*)(raw + offset);
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for (int i = 0; i < length / 8; ++i)
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{
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for (int k = 0; k < 2; ++k)
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{
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table[0,k] = (table[0,k] + table[1,k]) ^ xor[k];
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*encoded ^= table[0,k];
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xor[k] = *encoded++;
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}
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}
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}
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}
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}
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private byte[] Decompress (byte[] input)
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{
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if (LittleEndian.ToUInt32 (input, 0) != 0xFF435031)
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return null;
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bool is_16bit = 0 != (input[4] & 1);
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var node = new byte[2,256];
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var child_node = new byte[256];
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int output_length = LittleEndian.ToInt32 (input, 8);
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var output = new byte[output_length];
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int src = 12;
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int dst = 0;
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while (src < input.Length)
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{
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int i, k, count, index;
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for (i = 0; i < 256; i++)
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node[0,i] = (byte)i;
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for (i = 0; i < 256; )
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{
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count = input[src++];
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if (count > 127)
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{
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int step = count - 127;
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i += step;
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count = 0;
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}
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if (i > 255)
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break;
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count++;
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for (k = 0; k < count; k++)
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{
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node[0,i] = input[src++];
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if (node[0,i] != i)
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node[1,i] = input[src++];
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i++;
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}
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}
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if (is_16bit)
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{
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count = LittleEndian.ToUInt16 (input, src);
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src += 2;
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}
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else
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{
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count = LittleEndian.ToInt32 (input, src);
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src += 4;
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}
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k = 0;
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for (;;)
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{
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if (k > 0)
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index = child_node[--k];
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else
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{
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if (0 == count)
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break;
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count--;
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index = input[src++];
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}
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if (node[0,index] == index)
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output[dst++] = (byte)index;
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else
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{
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child_node[k++] = node[1,index];
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child_node[k++] = node[0,index];
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}
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}
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}
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if (dst != output.Length)
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return null;
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return output;
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}
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}
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}
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